My inline bathroom extractor fan is dead. It was one of these that came with a light: http://www.screwfix.com/p/manrose-in-line-centrifugal-shower-fan-kit-chrome-100mm/41379.

I've replaced it with a regular ceiling mounted extractor fan without a light, with a timer and hydrostat. One of these: http://www.manrose.com/specifications/Quiet_Fan.pdf

I've tried wiring my new fan using the Neutral (grey), Switched Live (Black) and Permanent Live (Brown) cables from the old fan as per the instructions. The new fan only turns on when I turn the bathroom light off. It doesn't switch on when I turn on the lights.

I've tried wiring the new fan using the Neutral (grey), but switching the Switched Live (Black) and Permanent Live (Brown) cables from the old fan. The new fan stays on permanently, even when we turn the lights off, the shower hasn't been used (non condensate) and when the timer has finished. We have to turn it off using the isolator on the wall.

I've tried wiring the new fan using the wires from the fan-light that came with the old fan. This doesn't work at all.

I've tried wiring the new fan using combinations of wires from the fan-light and old fan but this doesn't work either.

I can't simply replace the old in-line fan without ripping out the ceiling and wallboard.

Has anyone had success replacing an in-line fan and light with a ceiling fan only? I'm beat!

So the replacement extractor fan is working as designed...but in reverse. It turns off using the timer, when the light is on. When the light is turned off, it remains on continuously. It should be working the other way around.

It should be on continuously when the light is on ie your having a shower etc and it should turn off using the timer, when the light is switched off.

A guess is, live and switched live wrong, BUT it may also be (since its AC) Switched live and neutral wrong, but my brain hurts. You really should use a multi meter to find out which is live, switched live and neutral.

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